Part 1 Overview of normal motor development: overview; motor development; progression of observable movement behaviours; a neuro-behavioural perspective on movement; phases of motor control. Part 2 Motor development in movement impaired children: the issue of developmental delay versus difference; information derived from assessment instruments; motor development and characteristics of clumsy children; intellectually disabled children; children with Down syndrome. Part 3 Motor performance: overview; normally developing children; clumsy children; intellectually disabled children; children with Down syndrome; summary of the findings from the Literature Review on Motor Performance in Children who are normally developing, clumsy, intellectually disabled and with Down syndrome; a study of differences in motor performance in children who are normally developing, clumsy, intellectually disabled and with Down syndrome; results, discussion and implications of the study. Part 4 Fundamental movement patterns: overview; walking; running; jumping; catching; throwing; conclusions on findings from the Literature Review. Part 5 Sequences of fundamental movement patterns: overview; development and validation of movement sequences; the hypothesized developmental sequences; a study of the fundamental movement patterns of children who are developing normally, clumsy, intellectually disabled or have Down syndrome; discussion of the fundamental patterns. Part 6 Motor control: overview; motor control studies in children; interlimb bimanual movements; a study of interlimb control of motor impaired children; results of the study of timing and accuracy factors in interlimb control of motor impaired children; summary of the study. Part 7 Summary, implications and conclusions from the present studies - recommendations for physical activity programes: summary of the approach to movement behaviour adopted in the book; summary of the results of the movement behaviour studies in children who are normally developing, clumsy, intellectually disabled and with Down syndrome; implications of the results from the measures of movement behaviour in children who are normally developing, clumsy, intellectually disabled and with Down syndrome; recommendations for adapted motor programmes for children who are clumsy, intellectually disabled and with Down syndrome; activities suitable for sensory-motor, perceptual-motor and cognitive-motor development; implications of the present studies for motor development.